Mozilla launched new money-making projects this month, new attempts to diversify revenue, which relies almost entirely on payments from search providers – notably, browser rival Google.

Starting today, some Firefox users will see in-browser advertisements for a VPN (virtual private network) service that encrypts all traffic and routes it through a secure server.

[ Further reading: 14 must-have Firefox add-ons ]

"Across numerous studies we've consistently heard from our users that they want Firefox to protect their privacy on public networks like cafes and airports," contended Chris More, product lead of what Mozilla calls "Firefox Growth," in an October 22 post to a company blog.

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